250 research outputs found
Erratum: Large Magnetocaloric Effect And Refrigerant Capacity Near Room Temperature In As-cast Gd5ge2si2-xsn X Compounds (applied Physics Letters (2013) 102 (192410))
No full text[No abstract available]1042Carvalho, A.M.G., Tedesco, J.C.G., Pires, M.J.M., Soffner, M.E., Guimarães, A.O., Mansanares, A.M., Coelho, A.A., Large magnetocaloric effect and refrigerant capacity near room temperature in as-cast Gd5Ge2Si2 -xSnx compounds (2013) Appl. Phys. Lett., 102, p. 192410. , 10.1063/1.480697
Susceptibility to Malignant Hyperthermia.
No full textContains fulltext :
19527.pdf (Publisher’s version ) (Open Access)In this thesis the author studied the diagnostic procedures for susceptibility to malignant hyperthermia (MH), with special emphasis upon refining the biological diagnostic test and improving protocols and guidelines for investigation of MH susceptibility. MH is a pharmacogenetic disease of skeletal muscle which is mainly of concern during and following anaesthesia. Abnormalities in the calcium release channel of skeletal muscle sarcoplasmic reticulum, the ryanodine receptor, have been implicated as the central factor in the cause of the MH syndrome. The in vitro muscle contracture test (IVCT) is the standard test to establish an individual's risk of susceptibility to MH. The diagnostic sensitivity of 99.0% and the accompanying specificity of 93.6% of the standard halothane-caffeine IVCT have been determined in a joint European study. Sevoflurane, a potent inhalational anaesthetic agent that is structurally similar to halothane, has been able to trigger an abnormal contracture in human muscle in vitro. The IVCT is invasive, time consuming and it is a technically demanding test that requires expertise. Cultured skeletal muscle cells, obtained by percutaneous needle biopsies may well be applied in diagnostic tests for MH susceptibility since the dose-dependant Ca2+ response in cultured muscle cells of MH-susceptible individuals is significantly different from that of control individuals after exposure to halothane. Because MH displays a high level of locus heterogeneity, it is not feasible to diagnose MH susceptibility, and, more specifically, to exclude MH risk, on the basis of a simple genetic test alone. Clinical practitioners and geneticists of the European MH Group have agreed on guidelines for the detection of MH susceptibility using molecular genetic techniques. Evaluation of the diagnostic procedure in 4 European MH investigation units helped to gain an insight into the need for further standardisation and quality assurance for the diagnosis of MH.KUN Katholieke Universiteit Nijmegen, 11 november 2004Promotor : Sengers, R.C.A. Co-promotor : Gielen, M.J.M.136 p
Anisotropic Magnetocaloric Effect In Gadolinium Thin Films: Magnetization Measurements And Acoustic Detection
No full textIn this letter, it is demonstrated the ability of the magnetoacoustic technique in detecting the magnetocaloric effect in gadolinium thin films (1.0 μm and 3.0 μm thick), which is not accessible through conventional temperature sensors because of the reduced mass of the samples. The method, which detects the direct effect of the sample temperature variation, proved to be sensitive to the anisotropy of the films, making possible for the investigation of the anisotropic magnetocaloric effect. Magnetization measurements were also carried out, and from these measurements both the adiabatic temperature and the isothermal entropy variations were calculated. The acoustically detected magnetocaloric effect shows very good agreement with these calculations. © 2013 AIP Publishing LLC.11416Pecharsky, V.K., Gschneidner, Jr.K.A., (1999) J. Magn. Magn. Mater., 200, p. 44. , 10.1016/S0304-8853(99)00397-2Pecharsky, V.K., Gschneidner, Jr.K.A., (1997) Phys. Rev. Lett., 78, p. 4494. , 10.1103/PhysRevLett.78.4494Gadioli, G.Z., Rouxinol, F.P., Gelamo, R.V., Santos, A.O., Cardoso, L.P., Moraes, M.A.B., (2008) J. Appl. Phys., 103, p. 093916. , 10.1063/1.2838462Soffner, M.E., Guimarães, A.O., Da Silva, E.C., Mansanares, A.M., (2013) Appl. Phys. A, 112, pp. 403-409. , 10.1007/s00339-012-7414-4Guimarães, A.O., Soffner, M.E., Mansanares, A.M., Coelho, A.A., Carvalho, A.M.G., Pires, M.J.M., Gama, S., Da Silva, E.C., (2009) Phys. Rev. B, 80, p. 134406. , 10.1103/PhysRevB.80.134406Guimarães, A.O., Soffner, M.E., Mansanares, A.M., Coelho, A.A., Carvalho, A.M.G., Pires, M.J.M., Gama, S., Da Silva, E.C., (2010) J. Appl. Phys., 107, p. 073524. , 10.1063/1.3357375Soffner, M.E., Mansanares, A.M., Gandra, F.C.G., Coelho, A.A., Gama, S., Carvalho, A.M.G., Pires, M.J.M., Da Silva, E.C., (2010) J. Phys. D: Appl. Phys., 43, p. 445002. , 10.1088/0022-3727/43/44/445002Soffner, M.E., Tedesco, J.C.G., Pedrochi, F., Gadioli, G.Z., De Moraes, M.A.B., Guimarães, A.O., Da Silva, E.C., Mansanares, A.M., (2012) Thin Solid Films, 520, pp. 3634-3640. , 10.1016/j.tsf.2011.12.042Pecharsky, V.K., Gschneidner, Jr.K.A., (1999) J. Appl. Phys., 86, p. 565. , 10.1063/1.370767Glorieux, C., Thoen, J., Bednarz, G., White, M.A., Geldart, D.J.W., (1995) Phys. Rev. B, 52, p. 12770. , 10.1103/PhysRevB.52.12770Bahl, C.R.H., Nielsen, K.K., (2009) J. Appl. Phys., 105, p. 013916. , 10.1063/1.3056220Foldeaki, M., Chahine, R., Bose, T.K., (1995) J. Appl. Phys., 77 (7), p. 3528. , 10.1063/1.358648Miller, C.W., Williams, D.V., Bingham, N.S., Srikanth, H., (2010) J. Appl. Phys., 107, pp. 09A903. , 10.1063/1.3335515Kirby, B.J., Lau, J.W., Williams, D.V., Bauer, C.A., Miller, C.W., (2011) J. Appl. Phys., 109, p. 063905. , 10.1063/1.3555101Touloukian, Y.S., Powell, R.W., Ho, C.Y., Nicolaou, M.C., (1973) Thermophysical Properties of Matter: Thermal Diffusivity, , (IFI/Plenum, New York, Washington), Vol. 1
Spatial flood extent modelling. A performance based comparison
No full textThe rapid development of Geographical Information Systems (GIS) has together with the inherent spatial nature of hydrological modelling led to an equally rapid development in the integration between GIS and hydrological models. The advantages of integration are particularly apparent in flood extent modelling. In this thesis, the integration of hydrological models and GIS is approached on the basis of performance, with performance taken as the balance of computational efficiency, flexibility of application, and most importantly the reliability of the integrated model. It is shown that predictive reliability is dominated by model uncertainties, particularly in model roughness parameters. These roughness parameters are found to be more conceptual than physical as they represent bulk momentum loss parameters at the reach scale. Limited data on spatial extent of flooding is available to constrain these uncertainties, and where such data is lacking the simplest numerical approach may be as reliable as more complex approaches. The overall performance of the simple approach is then higher as this is more easily integrated within GIS. Observations of flood extent from aerial photographs may help constrain uncertainties, though much more value is found from distributed water level observations in the floodplain. The lack of hydrological data also results in high resolution GIS data of elevation or land use being of limited value. As sufficient hydrological data is unavailable and perhaps impossible to acquire, model predictions made are recommended to be considered probabilistically, irrespective the level of integration with GIS.Civil Engineering and Geoscience
Residual Stress Development due to High-Frequency Post Weld Impact Treatments for High-Strength Steels
No full textAllseas Engineering bv is an engineering center of the Allseas group, a major player in the offshore pipe lay market and recently expanding the activities to the offshore heavy lift sector. Because of the necessity to design and build lifting structures and equipment of a tremendously high capacity, the demand for high-strength steels usage has been arisen. These steels are to be welded and used in a harsh offshore environment. Localized heating and melting of a workpiece during welding lead to the build-up of residual stresses. When distortion is prevented due to constraints in structures or due to clamping, stress levels will be high and may exceed the yield strength. Post weld treatments are often carried out to mitigate or re-distribute the residual stresses. Ultrasonic impact techniques make use of the combined effects of the high frequency impacts and ultrasonic oscillations in the treated material. Ultrasonic impact treatment (UIT) has been applied successfully to increase the fatigue life of parts and welded elements, to eliminate distortion caused by welding and other technological processes, to relieve residual stresses, and to increase the hardness of materials. Although reported results on fatigue life are very promising, the detailed changes induced in the treated material and the mechanisms by which such changes occur are still poorly understood. In this research, the main objectives are to understand the stress build-up during multi-pass welding, and the mechanisms involved in post weld ultrasonic impact treatments, how these affect the residual stress state in the welded area.MPMPMechanical, Maritime and Materials Engineerin
Computer-assisted cartography for monitoring spatio-temporal aspects of urban air pollution
No full textCivil Engineering and Geoscience
Low-Frequency Electro-Magnetic Stirring during AC TIG Welding of AA6082
No full textTechnische MateriaalwetenschappenApplied Science
FRANK : het ontwerp van een nieuw landmeetsysteem gebaseerd op panoramische beelden
No full textCivil Engineering and Geoscience
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